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add O_MAYEXEC support for CLIP OS, zero cost otherwise 

cf. https://lwn.net/Articles/768819/
This commit is contained in:
tg 2018-10-30 17:10:16 +00:00
parent 8e4829bc5f
commit dddf3694e9
3 changed files with 10 additions and 6 deletions
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4
exec.c
View File

@ -23,7 +23,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.202 2018/10/07 01:10:11 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.203 2018/10/30 17:10:14 tg Exp $");
#ifndef MKSH_DEFAULT_EXECSHELL
#define MKSH_DEFAULT_EXECSHELL MKSH_UNIXROOT "/bin/sh"
@ -886,7 +886,7 @@ scriptexec(struct op *tp, const char **ap)
*tp->args-- = tp->str;
#ifndef MKSH_SMALL
if ((fd = binopen2(tp->str, O_RDONLY)) >= 0) {
if ((fd = binopen2(tp->str, O_RDONLY | O_MAYEXEC)) >= 0) {
unsigned char *cp;
#ifndef MKSH_EBCDIC
unsigned short m;

6
main.c
View File

@ -34,7 +34,7 @@
#include <locale.h>
#endif
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.349 2018/05/08 17:37:36 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.350 2018/10/30 17:10:15 tg Exp $");
#ifndef MKSHRC_PATH
#define MKSHRC_PATH "~/.mkshrc"
@ -513,7 +513,7 @@ main_init(int argc, const char *argv[], Source **sp, struct block **lp)
#else
s->file = argv[argi++];
#endif
s->u.shf = shf_open(s->file, O_RDONLY, 0,
s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0,
SHF_MAPHI | SHF_CLEXEC);
if (s->u.shf == NULL) {
shl_stdout_ok = false;
@ -713,7 +713,7 @@ include(const char *name, int argc, const char **argv, bool intr_ok)
volatile int old_argc;
int i;
shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC);
if (shf == NULL)
return (-1);

6
sh.h
View File

@ -182,7 +182,7 @@
#endif
#ifdef EXTERN
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.866 2018/10/20 18:45:58 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.867 2018/10/30 17:10:16 tg Exp $");
#endif
#define MKSH_VERSION "R56 2018/10/20"
@ -491,6 +491,10 @@ extern int __cdecl setegid(gid_t);
#define O_BINARY 0
#endif
#ifndef O_MAYEXEC
#define O_MAYEXEC 0
#endif
#ifdef MKSH__NO_SYMLINK
#undef S_ISLNK
#define S_ISLNK(m) (/* CONSTCOND */ 0)